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Ufficiali di Notte (on Wikipedia)

The Officers of the Night were established to root out the practice of sodomy in 1432 Florence, Italy

umchwasho

a traditional chastity rite in Swaziland. Unmarried women are not allowed to have sexual relations and must wear a traditional set of tassels usually made of wool and are worn around the neck like a scarf.

undescended testicle (also known as Cryptorchidism (on Wikipedia))

common birth defect regarding male genitalia, where one or both testes are absent from the scrotum.

undinism

(also urophilia, undinism, golden shower and watersports) is a paraphilia in which sexual excitement is associated with the sight or thought of urine or urination

uniform fetish

a sexual fetish in which either a person enjoys dressing in a uniform, or someone derives sexual pleasure from viewing a person dressed in this manner

unintended pregnancy

pregnancies that were unwanted at the time of conception

Universal Declaration of Sexual Rights

see Wikipedia:Universal_Declaration_of_Sexual_Rights#Declaration_of_Sexual_Rights

unnatural act {also known as Crime against nature (on Wikipedia)

a form of sexual behavior that is not considered natural and is seen as a punishable offense by law

unnatural sex

(see unnatural act above)

unprotected sex

unprotected sex or unsafe sex refers to engaging in sexual intercourse without the use of any barrier contraception or other preventive measures against STDs

unrequited love (on Wikipedia)

love that is not openly reciprocated or understood as such. The beloved may or may not be aware of the admirer's deep and strong romantic affections

unusual sex acts

(see unnatural act above)

uranism (on Wikipedia)

a 19th century term that referred to a person of a third sex — originally, someone with "a female psyche in a male body" who is sexually attracted to men, and later extended to cover homosexual gender variant females

Ureaplasma urealyticum (on Wikipedia)

a bacterium belonging to the family Mycoplasmataceae associated with a number of diseases in humans, including non-specific urethritis (NSU), infertility, chorioamnionitis, stillbirth, premature birth, and, in the perinatal period, pneumonia, bronchopulmonary dysplasia and meningitis

ureter (on Wikipedia)

the ureters are tubes made of smooth muscle fibers that propel urine from the kidneys to the urinary bladder

urethra (on Wikipedia)

a tube that connects the urinary bladder to the genitals for the removal of fluids from the body

Urethral Play

Any play involving the urethra.

urethral catheterization (on Wikipedia)

a latex, polyurethane, or silicone tube known as a urinary catheter is inserted into a patient's bladder via the urethra. Catheterization allows the patient's urine to drain freely from the bladder for collection

urethral crest (on Wikipedia)

an anatomical feature present in the urinary system of both males and females.

urethral foreign body insertion (on Wikipedia)

insertion of foreign bodies into the urethra, typically as the result of auto-erotic activities which can result in serious medical problems.

urethral self-instrumentation (on Wikipedia)

is the medical use of probes called sounds to increase the inner diameter of the urethra and to locate obstructions in it. Sounds are also used to stretch the urethra in order to receive piercing.

Urethral sounding

inserting urethral sounds into the urethra in medical play.

Urethral sounds / sounding

Medical device to be inserted into the urethra in medical play.

urethral sponge (on Wikipedia)

a spongy cushion of tissue found in the lower genital area of women that sits against both the pubic bone and vaginal wall, and surrounds the urethra.

urethral stricture

a narrowing of the urethra caused by injury or disease such as urinary tract infections or other forms of urethritis.

urethralism (on Wikipedia)

a sexual activity that involves sexual stimulation of the urethra. This may include paraphiliac activities such as the use of urethral sounding and urethral catheterization for sexual purposes.

urethroplasty (on Wikipedia)

a generalized term used to define a class of Surgery intended for the repair of an injury or defect within the walls of the urethra.

urethrorectal fistula (on Wikipedia)

an abnormal connection or passageway between two epithelium-lined organs or vessels that normally do not connect

urethrotome

(see urethrotomy below)

urethrotomy

an operation which involves incision of the urethra, especially for relief of a stricture.

urfi marriage / Nikah Urfi

An 'urfi marriage is a marriage without an official contract. Couples repeat the words, "We got married" and pledge commitment before God

urinary fistula (on Wikipedia)

a medical condition in which a fistula (hole) develops between either the rectum and vagina (rectovaginal fistula) or between the bladder and vagina (vesicovaginal fistula)

urinary incontinence

involuntary urination, or enuresis is any involuntary leakage of urine

urinary tract infection (on Wikipedia)

an infection that affects part of the urinary tract

urine (on Wikipedia)

a typically sterile liquid by-product of the body secreted by the kidneys through a process called urination and excreted through the urethra.

urningism

See uranism above

urogenital (on Wikipedia)

the organ system of the reproductive organs and the urinary system.[

urogenital diaphragm (on Wikipedia)

the muscular components of the deep perineal pouch.

urogenital folds (on Wikipedia)

urogenital sinus (on Wikipedia)

Urolagnia

Sexual excitement from urine or the act of urination

urology (on Wikipedia)

is the medical and surgical specialty that focuses on the urinary tracts of males and females

urophilia

a sexual fetish with a focus on urine and urination

urtication

flogging with nettles, is the process of deliberately applying stinging nettles to the skin in order to provoke inflammation

usus marriage

a form of Ancient Roman marriage where the wife is placed under the legal control of the husband by the cohabitation of the husband and wife for the duration of a year

uterine cancer (on Wikipedia)

refer to any of several different types of cancer which occur in the uterus

uterine horns (on Wikipedia)

the points where the uterus and the fallopian tubes meet

uterine orgasm (on Wikipedia)

an apparent orgasm of the uterus, usually by stimulation of an area just outside the cervix or by stimulation of the vaginal wall adjacent to this organ

Uterus - (also see page on 'Sex organs')

Either of the two ducts in female mammals through which ova pass from the ovaries to the uterus.

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